Field coil retaining means



April 5, 1960 H. F. HANSCOM 2,931,930

FIELD COIL RETAINING MEANS Filed Dec. 15, 1955 INVEN TOR. Haw/22's fi?Han s 0 am ga/WW ATTORNEYS.

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FIELD COIL RETAINING MEANS Harris F. Hanscom, Ban'ington, R.I., asslgnorto H. F. gilnsgom & Company, Inc., a corporation of Rhode an ApplicationDecember 15, 1955, Serial No. 553,274

2 Claims. (Cl. 310-194) duced with a double lap of insulation on oneside thereof.

' Another object of the invention is to provide a clip that may bereadily deformed and yet remain in position once deformed underreasonable stresses.

A still further object of the invention is to provide a clip which isparticularly adapted for holding field coils in place in fractionalhorsepower electric motors.

With these and other objects in view, the invention consists of certainnovel features of construction as will be more fully described andparticularly pointed out in the appended claims.

In the drawing:

Figure l is an end view of the field structure in a small electricmotor, showing the clip applied to the field coils;

Figure2 is a cross sectional view taken on line 2-2 of Figure 1, showingthe manner in which the clip holds the coil to the field structure;

Figure 3 is a perspective view of the clip as produced in finished form;

Figure 4 is a cross sectional view taken on line 4--4 of Figure 3;

Figure 5 is a perspective view illustrative of the method ofmanufacturing the clip in linear form;

Figure 6 is a cross sectional view showing the clip used to hold a wireto an insulating plate.

In proceeding with this invention, I preferably take a strip of steelstock of generally rectangular configuration and pass this stock througha covering machine which automatically folds insulating material aroundthe stock in a manner so that two layers thereof will be formed at oneof the sides thereof. In a subsequent operation I cut the strip intosuitable lengths for further utilization and form it to a proper sizeand shape in accordance with the particular application to which it willbe put.

Referring to the drawings, I show in Figure 5 a strip of stock which hasheretofore been referred to as steel but which may be formed from othermaterials so long as it meets the prime requisites of having asufficient stiffness to take a permanent set upon deformation and asufficient ductility to withstand bending. It will be noted that thisstrip 10 is encased on all sides with an insulating material such astreated paper stock generally designated 11 and which is made up of abase portion 12 and two fiaps13 and 14. It will be noted that one flap,in this case 13, has been folded down on the top of the strip, afterwhich the second flap 14 is folded thereover as designated by the arrowA. This condition can be met on a continuous forming machine which isnot the subject of this application and thus produced in strip form. Thefinished product is shown in cross section in Figure 4 wherein it willbe noted that the strip 10 is encased on Patented Apr. 5, 1960 one sidewith the layer 12 and on the opposite side with layers 13 and 14.

For an application as a field coil strip it is preferably formed to agenerally U-shaped configuration, as shown in Figure 3, there being twolegs of the U evenly spaced throughout the extent. Referring now toFigure 2, I have shown therein in cross section a portion of the fieldpole 16 which is of generally circular configuration, as seen inFigure 1. At spaced locations of this field pole there is provided aprojection 17 around which the field winding is adapted to be placed. Inorder to hold the field coil in place, the clip as shown in Figure 2 mayhave its legs spaced adjacent the sides 18 of the pole 16, at whichpoint they will lie along the sides 18 and considerably ,below theactual field winding 19. The legs 15 of the clip may then be bentupwardly and around the field winding 19 to the position as shown inFigure 2 and thus hold the field winding tightly against the pole 16. Itwill be noted that the clip is formed so that the double insulation ispresent adjacent the field winding 19 to provide added insulation atthis point between the pole piece and the winding itself.

It will be apparent, of course, that the clip may be made in otherforms, such as shown in Figure 6, wherein I have shown a clip of agenerally arched character that may be passed through suitable aperturesin an insulating plate 21 and then have its legs bent against thereverse side of the insulating plate 21 as at 22 to hold a cable such as23 in place against the plate. Other uses will, of course, occur tothose skilled in the art.

I claim:

1. Electric conductor supporting and retaining means comprising ametallic core, said core being rectangular in cross-section andincasedin a treated paper insulation folded around said core so as topresent two layers at one side thereof and a single layer on the otherside, said core being U-shape having parallel legs with aninterconnecting bridge, said core being ductile whereby the legs thereofmay be bent about a support to be secured thereto and be bent about anelectric conductor to be secured to said support, the two layerinsulations abutting said conductor, said core being sufiiciently stiffto take a permanent set so as to be self-retained in said bent relationagainst said support and said electric conductor.

2. In combination with a field magnet for an electric motor or the like,said magnet having a general cylindrical form with internal projections,field coil windings disposed in partial embracing relation with saidfield magnet about said projections opposite sides thereof extending atleast partially outward of the cylindrical form of said field magnet, aninsulating fastener for holding and securing said field coil to saidfield magnet comprising a metallic core encased in a treated paperinsulation folded around said core so as to present two layers at oneside thereof and a single layer on the other side, said core beingU-shaped and having parallel legs with an interconnecting bridge, saidbridge being engaged against the outer portion of said field magnet withsaid legs extending inwardly in the space between the ends of saidmagnet and said field coil and with the said two layers being positioned next to said field coil, said fastener being ductile, each ofsaid legs being bent in a reversed direction about said field coil tohold the same against said magnet, the ends of said fastener being inproximity to the bridge thereof, said fastener being sufficiently stifito take a permanent set and remain engaged against said field magnet andsaid field coil.

(References on following page) 1 v 3 Refe'ren'cs Cited in the file ofthis patent 1,922,258 Packer Aug. 15, 1933 2,237,999 Apt-{3, 1941 566,588 2,400,008 Korte May 7, 1946 128;431 2,465,820 Shartowt-l. Mar.29, 1949 Rubles Oct. 24, 1950 Linke Nov. 13, 1951 FOREIGN PATENTSSwitzerland Sept. 27, 1913 Great Britain June 26, 1919

